A suggestion
or two.
Have someone near the car try to pinpoint where the sound is coming from when you start the car in the morning when it has been most liable to occur.
Put the top in the service position (see the owner's manual) and remove the cover from the top of the engine (yes, you can do it...it is self obvious) and repeat the "see if you can figure out where in the car the noise if coming from" above.
Wiggle the exhaust pipe (when it is cold).
Could be the heat shield for the cats, exhaust, or any loose part.
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